Mickey, I think a better choice for the 9.3 would be a set of cape gun barrels, with a 20ga 3" on the left, and a 9.3X74R on the right, Though the rifle barrel would be thin, it would still be about equal to the shot barrel. The fact is as NEW-GUY says, anything you do is a compromize at best. These "systems" weren't designed to be a "SHIFT ON THE FLY" systems, but are a way of transporting two, or three guns in the case without the inconvenience of haveing to lugg Three cases of rifles and a shot gun through airports all over the world. A 450.400 3" with a set of 9.3X74R barrels, with scope attachment, and a set of 20 ga 3"/ 9.3X74R cape tubes, would be a nice set-up for a rancher in the bush, for day to day business of running a ranch. It would be nice as well for me, on an extended hunt, where I had a day off now, and then, to shoot doves, or to hunt small antilope. None of the barrel sets are going to work as well as the 450/400 3" barrels, but nothing is that general purpose. Like most REAL 4X4 ATVs, they are better when utilized for one purpose instead of the others, but are usefull for all!